Zool— Vol. I.] BANKS— MEXICAN ARACHNIDA. 219 



One female from Minititlan, Feb. 3, 1892. (Bruner 

 coll.). Closely related to P. gentilis, but separated by shape 

 of epigynum, and darker anterior tibiae and patella? . 



43. Prosthesima atra Hentz. — Three specimens from the 

 Cape Region of Baja California. They are not so black 

 as eastern specimens, but as dark as those from Washing- 

 ton State. The epigynum is a large opening, narrowed 

 behind, but not sufficient to consider as a distinct species, 

 but rather a geographical race. 



44. Prosthesima directa, sp. nov. 



Plate XIII, Fig. 21. 



Length 7.5 mm. Cephalothorax shining yellowish; legs and sternum sim- 

 ilar; mandibles more reddish; abdomen pale grayish, with four impressed 

 dark dots above, and a basal, horny shield reaching half way to the middle 

 of dorsum. Cephalothorax moderately slender; posterior eye-row slightly 

 procurved; P. M. E. hardly round, scarcely their diameter apart, and about 

 as far from the equal P. S. E.; anterior row straight or barely recurved; A. 

 M. E. large, less than their diameter apart, and not so far from the A. S. E. ; 

 mandibles scarcely porrect; sternum once and a third longer than broad, 

 narrowed in front and behind. Legs moderately long; three pairs of spines 

 under the anterior tibia, and one pair under the base of anterior metatarsi; 

 posterior pairs numerously spined; anterior tarsi with fine scopulas. Abdo- 

 men hardly depressed, twice as long as wide; spinnerets long, the superior 

 pair two-thirds as long as inferior pair. The S palpus has the tibia a litt,le 

 longer than broad, and a slender spine-like projection at the outer tip, the 

 bulb long and quite simple, at the end a pale part with a fine short tip. 



One <5 from La Chuparosa. Related to P. valida Bks., 

 from California, but readily separated by having a straight 

 (instead of curved) projection at tip of the tibia of & palpus. 



45. Prosthesima completa, sp. nov. 



Plate XIII, Fig. 22. 



Length 7 mm. Cephalothorax yellowish; legs similar, paler at base; man- 

 dibles and sternum more reddish; abdomen paler grayish; clothed with black 

 hair, most prominent at the base of abdomen, a horny shield at base, but 

 hardly extending upon the dorsum. Posterior eye-row nearly straight; the 

 P. M. E. slightly oval, hardly one-half their diameter apart, a little further 

 from the equal P. S. E. ; A. M. E. smaller, nearly their diameter apart and 

 much closer to the A. S. E. ; mandibles scarcely porrect; sternum oval, rather 



